Lag, or delay, refers to the time it takes for data to travel from one point to another in a system. This can occur in various contexts, such as in computer networks, video games, or online communication. When lag happens, users may experience a noticeable delay between their actions and the system's response, which can affect performance and user experience. In gaming, for example, lag can lead to a frustrating experience where players' movements are not synchronized with the game's actions. This can be caused by slow internet connections, high server load, or distance from the server. Reducing lag is essential for smooth gameplay and effective communication in digital environments.